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. 2015 Nov 2;5:15912. doi: 10.1038/srep15912

Table 4. Description of sampling frequencies.

Sampling frequency Sampling interval (days) Permutations Examples
Daily 1 1 Sunday
      Monday
      Tuesday etc
3 days a week 2 7 Sunday-Tuesday-Thursday
      Monday-Wednesday-Friday
      Tuesday-Thursday-Saturday etc
1 day a week (weekly) 7 7 Every Sunday
      Every Monday
      Every Tuesday etc
1 day every 2 weeks (bi-weekly) 14 14 Every Sunday (week 1 of 2)
      Every Sunday (week 2 of 2)
      Every Monday (week 1 of 2)
      Every Monday (week 2 of 2) etc
1 day every 4 weeks (4-weekly) 28 28 Every Sunday (week 1 of 4)
      Every Sunday (week 2 of 4)
      Every Sunday (week 3 of 4)
      Every Sunday (week 4 of 4) etc